This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A091810 #8 Sep 08 2022 08:45:13
%S A091810 1,2,96,497664,825564856320,1027134771639091200000,
%T A091810 1932215036193527461576704000000000,
%U A091810 9973959265081827837426668870219857920000000000000
%N A091810 Hankel transform of the sequence A001469 (unsigned), Genocchi numbers of first kind.
%C A091810 This sequence is the Hankel transform (see A001906 for definition)of the sequence defined by, for n>=0, a(n) = |A001469(n+1)|; example: det([1, 1, 3, 17; 1, 3, 17, 155; 3, 17, 155, 2073; 17, 155, 2073, 38227]) = 497664 = 4!*12^4.
%H A091810 G. C. Greubel, <a href="/A091810/b091810.txt">Table of n, a(n) for n = 0..24</a>
%F A091810 a(n) = (n+1)!*A000178(n)^4 = (n+1)!*A055209(n)^2.
%t A091810 Table[(n + 1)!*BarnesG[n + 2]^4, {n, 0, 10}] (* _G. C. Greubel_, Oct 14 2018 *)
%o A091810 (PARI) for(n=0,10, print1((n+1)!*(prod(k=0,n, (k!)^2))^2, ", ")) \\ _G. C. Greubel_, Oct 14 2018
%o A091810 (Magma) [Factorial(n+1)*(&*[(Factorial(k))^2: k in [0..n]])^2: n in [0..10]]; // _G. C. Greubel_, Oct 14 2018
%Y A091810 Cf. A000178 A001469 A001906 A055209.
%K A091810 nonn
%O A091810 0,2
%A A091810 _Philippe Deléham_, Mar 07 2004